/*
#define E 27
#define S0 5
#define S1 18
#define S2 19
#define S3 23

const int potPin = 35;  // Analog pin
 
*/


    /* 0- General */

    #define S0 5                             /* Assign Multiplexer pin S0 connect to pin D0 of NodeMCU */
    #define S1 18                             /* Assign Multiplexer pin S1 connect to pin D1 of NodeMCU */
//    #define S2 D2                             /* Assign Multiplexer pin S2 connect to pin D2 of NodeMCU */
//    #define S3 D3                             /* Assign Multiplexer pin S3 connect to pin D3 of NodeMCU */
    #define SIG 35                            /* Assign SIG pin as Analog output for all 16 channels of Multiplexer to pin A0 of NodeMCU */

    int decimal = 2;                          // Decimal places of the sensor value outputs 
    int sensor0;                            /* Assign the name "sensor0" as analog output value from Channel C0 */
    int sensor1;                            /* Assign the name "sensor1" as analog output value from Channel C1 */
    int sensor2;                            /* Assign the name "sensor2" as analog output value from Channel C2 */
    int sensor3;                            /* Assign the name "sensor3" as analog output value from Channel C3 */
   int wait = 5;


void setup() {                                /* Put your codes here to run only once during micro controller startup */

    /* 0- General */
    
    pinMode(S0,OUTPUT);                       /* Define digital signal pin as output to the Multiplexer pin SO */        
    pinMode(S1,OUTPUT);                       /* Define digital signal pin as output to the Multiplexer pin S1 */  
  //  pinMode(S2,OUTPUT);                       /* Define digital signal pin as output to the Multiplexer pin S2 */ 
  //  pinMode(S3,OUTPUT);                       /* Define digital signal pin as output to the Multiplexer pin S3 */  
    pinMode(SIG, INPUT);                      /* Define analog signal pin as input or receiver from the Multiplexer pin SIG */  
    
    Serial.begin(9600);                       /* to display readings in Serial Monitor at 9600 baud rates */

}

void loop() {                                 /* Put your codes here to run over and over again endlessly */

    /* 0- General */

    // Channel 0 (C0 pin - binary output 0,0,0,0)
    digitalWrite(S0,LOW); digitalWrite(S1,LOW);
delay(wait);
    sensor0 = analogRead(SIG);
  
    // Channel 1 (C1 pin - binary output 1,0,0,0)
    digitalWrite(S0,HIGH); digitalWrite(S1,LOW); 
  delay(wait);
    sensor1 = analogRead(SIG);

    // Channel 2 (C2 pin - binary output 0,1,0,0)
    digitalWrite(S0,LOW); digitalWrite(S1,HIGH); 
  delay(wait);
    sensor2 = analogRead(SIG);
//  delay(wait);
    // Channel 3 (C3 pin - binary output 1,1,0,0)
    digitalWrite(S0,HIGH); digitalWrite(S1,HIGH);
  delay(wait);
    sensor3 = analogRead(SIG);


    Serial.print("Sensor 1 : ");Serial.println(sensor0);          /* state value for sensor 0 */
    Serial.print("Sensor 2 : ");Serial.println(sensor1);          /* state value for sensor 1 */
    Serial.print("Sensor 3 : ");Serial.println(sensor2);          /* state value for sensor 2 */
    Serial.print("Sensor 4 : ");Serial.println(sensor3);          /* state value for sensor 3 */
Serial.println();
  
    delay(1000);                                                  // Read the value every second

}